How do I block incoming calls?

Many iPhone owners expect that incoming call blocking is a built-in feature of the iPhone. Unfortunately, this is not the case. This feature is controlled by your wireless service provider, and they often charge an exorbitant rate for it. There is, however, one way to deal with unwanted, incoming calls: Silence their rings. Here's an easy way to do it, but you will need a computer with a microphone.

Use a sound recorder to create silent ringtones for calls you want to block.